﻿//*********************************************************
//
// Copyright (c) Microsoft. All rights reserved.
// This code is licensed under the MIT License (MIT).
// THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
// IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
// PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
//
//*********************************************************

using System;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;

// The Blank Application template is documented at http://go.microsoft.com/fwlink/?LinkId=402347&clcid=0x409

namespace ScreenCasting
{
    /// <summary>
    /// Provides application-specific behavior to supplement the default Application class.
    /// </summary>
    sealed partial class App : Application
    {
        /// <summary>
        /// Initializes the singleton application object.  This is the first line of authored code
        /// executed, and as such is the logical equivalent of main() or WinMain().
        /// </summary>
        public App()
        {
            this.InitializeComponent();
            this.Suspending += OnSuspending;
        }

        /// <summary>
        /// Invoked when the application is launched normally by the end user.  Other entry points
        /// will be used such as when the application is launched to open a specific file.
        /// </summary>
        /// <param name="e">Details about the launch request and process.</param>
        protected override void OnLaunched(LaunchActivatedEventArgs e)
        {
#if DEBUG
            if (System.Diagnostics.Debugger.IsAttached)
            {
                this.DebugSettings.EnableFrameRateCounter = false;

            }

#endif
            Application.Current.UnhandledException += Current_UnhandledException;

            Window.Current.Activate();
                
            Frame rootFrame = Window.Current.Content as Frame;

            // Do not repeat app initialization when the Window already has content,
            // just ensure that the window is active
            if (rootFrame == null)
            {
                // Create a Frame to act as the navigation context and navigate to the first page
                rootFrame = new Frame();
                // Set the default language
                rootFrame.Language = Windows.Globalization.ApplicationLanguages.Languages[0];

                rootFrame.NavigationFailed += OnNavigationFailed;

                if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    //TODO: Load state from previously suspended application
                }

                // Place the frame in the current Window
                Window.Current.Content = rootFrame;
                Window.Current.Activate();
            }

            if (rootFrame.Content == null)
            {
                // When the navigation stack isn't restored navigate to the first page,
                // configuring the new page by passing required information as a navigation
                // parameter                
                try
                {
                    rootFrame.Navigate(typeof(MainPage), e);
                }
                catch (Exception ex)
                {
                    Window.Current.Content = new Frame();
                    Window.Current.Activate();
                    rootFrame.Navigate(typeof(UnhandledExceptionPage), e.Arguments);
                    ((UnhandledExceptionPage)rootFrame.Content).StatusMessage = ex.Message + ex.StackTrace;
                }

            }
           

            // Ensure the current window is active
            Window.Current.Activate();
        }

        private void Current_UnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            Window.Current.Content = new Frame();
            Frame rootFrame = Window.Current.Content as Frame;
            Window.Current.Activate();
            rootFrame.Navigate(typeof(UnhandledExceptionPage));
            ((UnhandledExceptionPage)rootFrame.Content).StatusMessage = e.Exception.Message + e.Exception.StackTrace;
        }

        protected override void OnActivated(IActivatedEventArgs args)
        {
            try
            {
                Window.Current.Content = new Frame();
                Frame rootFrame = Window.Current.Content as Frame;
                Window.Current.Activate();


                if (args.Kind == ActivationKind.DialReceiver)
                {
                    rootFrame.Navigate(typeof(MainPage), args);
                }
                else
                {
                    rootFrame.Navigate(typeof(MainPage));
                }
                base.OnActivated(args);
            }
            catch (Exception ex)
            {
                Window.Current.Content = new Frame();
                Frame rootFrame = Window.Current.Content as Frame;
                Window.Current.Activate();
                rootFrame.Navigate(typeof(UnhandledExceptionPage));
                ((UnhandledExceptionPage)rootFrame.Content).StatusMessage = ex.Message + ex.StackTrace;
            }
        }

        /// <summary>
        /// Invoked when Navigation to a certain page fails
        /// </summary>
        /// <param name="sender">The Frame which failed navigation</param>
        /// <param name="e">Details about the navigation failure</param>
        void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
        }

        /// <summary>
        /// Invoked when application execution is being suspended.  Application state is saved
        /// without knowing whether the application will be terminated or resumed with the contents
        /// of memory still intact.
        /// </summary>
        /// <param name="sender">The source of the suspend request.</param>
        /// <param name="e">Details about the suspend request.</param>
        private void OnSuspending(object sender, SuspendingEventArgs e)
        {
            var deferral = e.SuspendingOperation.GetDeferral();
            //TODO: Save application state and stop any background activity
            deferral.Complete();
        }
    }
}
